1. double-ringed bases are purines exempt from chargaff's rules complementary with each other pyrimidines 2. which of the following is not a characteristic of chargaff’s rule #1? is also termed chargaff's ratio states that t = a and g = c states that dna composition varies among species states that the ratio of adenine to thymine is equal, as is the ratio of guanine to cytosine 3. what type of bonds are formed between complementary bases? triple carbon to carbon bonds hydrogen bonds ionic bonds polar covalent bonds 4. are single-ringed bases. guanines adenines purines pyrimidines

One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails. b. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. c. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails have other functions,because prokaryotes don't have nuclei.